45 lines
1.3 KiB
Java
45 lines
1.3 KiB
Java
/**
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*
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* Copyright 2020 Florian Schmaus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.test.util;
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import java.lang.reflect.Field;
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import org.apache.commons.lang3.reflect.FieldUtils;
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public class Whitebox {
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public static <T> T getInternalState(Object object, String fieldName, Class<T> fieldType) {
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Class<?> objectClass = object.getClass();
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Field field = FieldUtils.getField(objectClass, fieldName, true);
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Object res;
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try {
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res = field.get(object);
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} catch (IllegalArgumentException | IllegalAccessException e) {
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throw new AssertionError(e);
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}
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if (!fieldType.isInstance(res)) {
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throw new AssertionError(res + " is not a (sub)type of " + fieldType);
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}
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return fieldType.cast(res);
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}
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}
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